Add dimension to your project with this Classical Flat Bottom Groove Profile.This bit is ideal for adding bearings to the shank for following templates. Select a bearing with the same inside diameter as your shank size. Outside diameter should be the same size or larger than the large diameter of your router bit. Secure bearings with a lock collar. Use Lock Collar #LC-1/4 for 1/4” shanks or #LC-1/2 for 1/2” shanks.